#include <stdio.h>

int main(){
    char *p[2]={
        "hello",
        "world!"
    };
    char q[2][20]={
        "hello",
        "world!"
    };
    printf("%zd字节,%zd字节\n",sizeof(p),sizeof(q));
    printf("************\n");
    q[1][0]='X';
    printf("%c\n",q[1][0]);
    printf("************\n");
    p[1][0]='X';
    printf("%c\n",p[1][0]);
    // printf("************\n");
    // printf("");
}